Furnace



J. M. ROE.

A(No Model.)

FURNACE.

Patented Dec. 21,1897.

UNITED STATES PATENT I'EEicE.

JOHN M. ROE, OF AUSTIN, ILLINOIS, ASSIGNOR TO THE JOGADA FURNAOE COMPANY, OF OREGON.

SPECIFICATION forming part of Letters Patent No. 595,837, dated December 21, 1897.

Application filed October l5, 1895. Serial No. 565,719. (No model.)

To all whom it may concern:

Be it known that I, JOHN M. ROE, residing at Austin, in the county of Cook and Stat-e of Illinois, have invented Improvements in Furnaces, of which the following is a specification.

This invention relates to improvements in furnaces, and relates particularly to improvements in furnaces in combination with an underfeed mechanical stoker of the type heretofore patented to Evan W. Jones by Letters Patent of the United States No. 409,7 92, dated August 27,1889, and No. 470,052, dated March l, 1892, and comprising as essential elements a fuel-magazine located below the bottom of the furnace and in open communication with said furnace throughout its entire length, a feed mechanism adapted to deliver fuel into said fuel magazine or retort and to discharge it thence into said furnace, twyers through which air to support combustion is supplied to said furnace, and means to deliver air under pressure to said twyers. The invention also relates to improvements in said stokers themselves.

^ A principal object of my invention is to provide an improved auxiliary feed mechanism adapted to supplement the action of the pri` mary feed mechanism, which delivers fuel into said retort, so that fuel will be conveyed to and delivered into the furnace along the entire length of said retort.

This invention consists in the various features, combinations of features, and details of construction hereinafter described and then pointed out in the claims.

In the accompanying drawings a furnace embodying my invention is fully illustrated.

Figure 1 is a longitudinal vertical sectional view through a furnace equipped With my improved stoker. Fig. 2 is a top plan view of the bottom of a furnace equipped with my improved stoker, and Fig. 3 is a transverse sectional view thereof on the line 3 3 of Fig. 1.

Referring now to the drawings, in which I have shown a stoker embodying my improvements applied to the furnace of a tubular boiler of ordinary construction, A designates the boiler-settings forming the sides of the or retort of a stoker with which said furnace is equipped.

O designates as a Whole a primary feed mechanism, and D designates as a whole an auX- iliary feed mechanism located in the retort B and adapted to supplement the action of the primary feed mechanism O.

The boiler and setting may be of any usual or approved construction and need not be described in detail. The fuel magazine or retort B consists of an open trough-shaped receptacle extending longitudinally beneath the furnace or fire-box and having an air-tight bottom. The top of said retort B is flush with the bottom of the furnace, and said furnace and retort are in open communication. Twyerboxes B are formed at the top of the fuel magazine or retort B, one on each side thereof. Preferably said retort B is made in separate sections, comprising a main body portion B2 and the twyer-boxes B', forming upward continuations thereof, said body portion and tWyer-boxes being secured together by means of bolts b, which engage elongated holes or slots in the body portion of the retort, or in other suitable manner to allow expansion of the tWyer-boXes independently of said main body portion.

In the preferable construction shown the tops of thef-tWyer-boxes B' are formed open and are closed by means of a plurality of separate tWyer-blocks or twyer-caps bwhich are so constructed as to leave openings b3 along` the upper inner edges of said retort. Said twyer-blocks are secured in position by means of rods b4, which pass through eyebolts b5 h6, secured in said twyer-blocks and in the bottoms of the tWyer-boXes, respectively.

The front ends of the twyer-boXes B project through the furnace-front and are connected by means of a pipe B2 with a pipe B3, which communicate with a blowing-engine or other suitable source of supply of air under pressure. The amount of air delivered to the twyer-boxes B may be conveniently regulated by means of dampers located in the pipe B3. As heretofore constructed the bottoms of the retorts B have sloped gradually upward and backward, so that at their rear ends said retorts were very shallow and the body of coal contained therein very thin. For reasons which I will specify hereinafter I prefer to make the bottoms of said retorts substantially horizontal, so that they will be of about the same depth at front and rear, and the rear end thereof being upwardly and rearwardly curved or inclined at 'an abrupt angle-say from forty-five degrees to sixty degrees from the horizontal-all as clearly shown in the drawings.

As shown, the primary feed mechanism C consists of a ram or plunger C, fitted to and longitudinally movable in a cylinder C, secured to the front end of the retort B, the bore of which registers with an opening formed in the front end of said retort.

Secured to the top of the cylinder C2 is a hopper C3, which contains thefuel for feeding the furnace and which communicates with theinterior of said cylinder C2 by means of an opening c in said cylinder, which said opening is alternately opened and closed by the feed-ram C' as said ram is retracted and advanced. Obviously the hopper C3 being full of fuel, as the plunger C is retracted the opening c will be uncovered, allowing the fuel to pass by gravity from said hopper into said cylinder, and as the ram or plunger advances said opening will be closed and the fuel in said cylinder forced therefrom into the retort or fuel-magazine B and thence into the furnace or fire-box.

Any desired or approved means maybe employed for imparting a reciprocating movement to the plunger C'. In practice, however, I prefer to connect the same rigidly to a piston-rod c', aiiixed to a piston C4, fitted to a steam-cylinder C5.

The Stoker is provided with the usual deection-plate C6, whereby the fuel is supported and prevented from falling back into the cylinder C2 as the ram O' is retracted.

The auxiliary feed mechanism D is the same in principle as that shown and claimed in an application for Letters Patent of the United States heretofore filed by me on the 25th day of August, 1894, Serial No. 521,288, but differs therefrom in important features.

As heretofore constructed my auxiliary feed mechanism has been open to an objection which arises from the shallowness of the feed-magazine B at its rear end and from the further fact that the inner end of said auxiliary feed-rod was unsupported. Owing to this construction the end of said rod would become so much heated'that a comparatively slight resistance to its rearward movement would cause the end thereof to bend upward into the fire, where it would soon be burned off. These defective features I have overcomeby deepening the rear end of the retort and-by providing a bearing for the rear end of said rod.

I will now describe my improved auxiliary feed mechanism in detail.

In the bottom of the retort or fuel-magazine B is a rod or bar D', which is supported and longitudinally movable in holes or openings formed one in the rear end and one in the front end of said retort or fuel-magazine, so as to be substantially parallel with the bottom of said retort B. Secured to the rod or bar D' are any desired number of blocks d, the rear faces of which Vare preferably substantially perpendicular to the bottom of the retort and the front faces of which are upwardly and rearwardly inclined. I have shown two blocks CZ in the drawings.

A reciprocating movement is imparted to the rod or bar D by means of suitable connection between said rod or bar and the ram plunger C'. As shown, a link D2, pivoted to the front end of the rod or bar D', connects said rod or bar with a lug or projection d on the ram or plunger C', which extends through a slot cl2 in the bottom of the ram-cylinder C2. It is desirable that provision be made to vary the travel of the rodor bar D', so as to adapt the auxiliary feed for use with different kinds of coal. To effect this, the link D2 is forked where it engages the lug d', which fork embraces said lug d'. The free end of said link rests upon a pin d3, secured in said lug d and projecting laterally on both sides thereof. Secured in the forked end of the link D2 are transverse pins d4 d5, one on each side of the lug d and in the path thereof. As the ram or plunger C moves in either direction the lug will strike one or the other of the pins df* (Z5 and will impart to the rod or bar D a movement in the same direction as the said plunger, the length of which movement will depend upon the distance between the pins d* d5. The said pins d4 Z5 are interchangeable in a series of holes d6, formed in said link, which are so located that the travel of said rod may be varied, as desired, between limits ranging from nothing to the full travel of the ram or plunger C.

As shown, the lug d is formed integral with a ring D3, fitted to and secured inthe inside of the ram or plunger D' at its outer end, a recess being formed in the end of said plunger to receive said lug d'.

The relation of the various parts of the primary and secondary feed mechanisms is such that the slot d2 in the ram-cylinder C2 will never be uncovered between the end of said ram and the fuel-magazine.

I claiml. In a mechanical Stoker, the combination of a retort or fuel-magazine provided with twyers adjacent to its upper inner edges, means to supply air to said twyers, a primary feed mechanism and an auxiliary feed mechanism located in said retort, substantially as described.

2. In a mechanical stoker, the combination with a retort or fuel-magazine and a primary feed mechanism, of an auxiliary feed mechanism, comprising a rod or bar, which extends longitudinally of said retort or fuelmagazine and is supported, adjacent to its ends in suitable bearings formed in the front IOO IIO

and rear walls of said retort, lateral projections from said rod or bar and means to impart a reciprocating movement thereto, substantially as described.

3. In a mechanical stoker, the combination with a retort or fuel-magazine of substantially uniform depth and a primary feed mechanism, of an auxiliary feed mechanism, comprising a rod or bar, which extends longitudinally of said retort or fuel-magazine and is supported, adjacent to its ends in suitable vbearings formed in the front and rear walls of said retort, lateral projections from said rod or bar and means to impart a reciprocating movement thereto, substantially as described.

4. In a mechanical stoker, the combination with a retort or fuel-magazine and a primary feed mechanism, of an auxiliary feed mechanism, located in said retort, adjacent to the bottom thereof, and comprising a rod or bar supported and longitudinally movable in bearings formed in. the front and'rear ends of said retort, lateral projections'on said rod or' bar, means to impart a reciprocating movement to said rod or, bar and means to vary the travel thereof, substantially as described.

5. In a mechanical Stoker, the combination with a retort or f nel-magazine and a feed-ram, of an auxiliary feed mechanism, located in said retort, adjacent to the bottom thereof, and comprising a rod or bar supported and longitudinally movable in bearings formed in the front and rear ends of said retort, lateral projections from said rod or bar and driving connection between said feed-ram and said rod or bar, said driving connection comprising a link secured to the end of said rod or bar, the free end of which is supported adjacent to a rigid projection or lug on said feed-ram, pins secured in said link, which project into the path of said projection on the feed-ram, said pins being interchangeable in a series of holes formed in said link, whereby the travel of said rod or bar may be varied, substantially as described.

6. In a mechanical stoker, the combination with a retort or fuel-magazine of substantially uniform depth and a feed-ram, of an auxiliary feed mechanism, located in said retort, adjacent to the bottom thereof, and comprising a rod or bar supported and longitudinally movable in bearings formed in the front and rear ends of said retort, lateral projections from said rod or bar and driving connection between said feed-ram and said rod or bar, said driving connection comprising a link secured to the end of said rod or bar, the free end of which is supported adjacent to a rigid projection or lug on said feed-ram, pins secured in said link, which project into the path of said projection on the feed-rain, said pins being interchangeable in a series of holes formed in said link, whereby the travel of said rod or bar may be varied, substantially as described.

7. In a mechanical Stoker, the combination with a retort of substantially uniform depth and a feed-ram, of an auxiliary feed mechanism, located in said retort,.adjacent to the bottom thereof, and comprising a rod or bar su pported and longitudinally movable in suitable bearings formed' in the front and rear ends of said retort, lateral projections from said rod or bar, a forked link pivoted to the end of said rod or bar, which projects without the furnace, a ring secured in the inside of the feed-ram adjacent to the end thereof remote from said furnace, a rigid projection therefrom, which projects through a slot in the ram-cylinder, the forked end of the link, pivoted to the auxiliary feed rod or bar, embracing said rigid projection on the feed-ram and resting on a transverse pin secured therein, a series of holes formed in said link and pins interchangeably secured in said holes, one on each side of the projection on JNo. M. Ron.

Witnesses:

CHARLES A. BROWN, F. C. CRITTENDEN. 

